Alternating-current regulator.



PATENTBD MAR. 24, 1908.

A. R. EVEREST. ALTERNATING CURRENT REGULATOR.

APPLICATION FILED JULY 13, 1906.

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, tion simplified and c that the ratio of the reluctance in the path" UNITED STATESPATENT OFFICE.

AUGUSTINE R. EVEREST, OF RUGBY, ENGLAND, ASSIGNOR TO GENERAL ELECTRIC COMPANY,

A CORPORATION OF NEW YORK.

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Specification 0: Letters Patent.

Patented March 24, 1908.

Application men. July 13, 1906. Serial No. 326,022;

To all whom it may concern: v

Be it known that I, Auous'rnvn R. EVER- ns'r, a subject of the King of Great Britain 'and- Ireland, residing at' Itugby',' England,-

cient of mutual inductance between cooper.-

ating windings and comprises certain features of construction and arrangement of the wind ings and the cooperating core of magnetic material'whereby the operation of the regulating device may be improved and its construceapened.

In applying my invention to a constant current, transformer I arrange the-core material in the neighborhood of the cooperating windings, when they are in proximity to each other, at or near the full load condition so ofthe leakage flux betweenthe windings to the reluctance in the path of the flux inclosing the windings is made appreciably higher than when the windings are separated from eachother as in the partialor no load con dition. I

The various features of novelty which characterize my invention are pointed out with particularity in the claims annexed to and forming a part of this specification. :f'For a better understanding of my invention, how? ever, and of the advantages possessed by it,

reference may be had to the accompanying drawings an descriptive matter in which I have illustrated and described one of the forms in which my invention. may be "entbodied,

In the drawing, Figure 1 is a-seotion'al ele vation, wit h parts broken away and in sec tion', of a well known t e of constant c'ur .rent transformer embo ying my invention;

' Fig. 2 is a plan view of the same transformer;

.and Fig. 3 is a partial elevation illustrating a modified core construction.

The constant current transformer proper as shown, com rises a core of laminated magnetic materia consisting of three vertical legs 1, 2 and 3 which *are connected at their upper and lower ends by horizontal le i. or branches 4 and 5 respectively. One 0 the above the core.

core and the points marke coils or windings 6 oi the transformer is stationary and is shown resting upon the bottom portion 5 of the core. The other coil 7 is connected by members 9, the upper ends of which are con vnected to the upper ends of are shaped members 10 carried at the ends of lever armsl 1. The lever arms 1.1 are rigidly connected. to a shaft 12 journaledin brackets 13 supported A lever arm 14 rigidly connected to the shaft 12 supports at its free end an arcshaped member 15 to the upper end of which .is connected a flexible member 16.

The lower end of the flexible member 16 sup-. ports a counterweight 17. The counterweight 17 is not heavy enough to over-balance the weight of the coil 7 which is moved from the position shown in full lines into the position shown in dotted lines under the action of gravity when gravity is the only force controlling the position of the coil.

Usually the primary coil having its termi nals connected toa suitable source of alternating current is thestationary coil and the secondary coil having its terminals connected to a consumption circuit is the movable coil of the apparatus.

. As shown, the a r gap between the leg 2 links 8 to a pair of flexible and each of the outside legs 1 andB is of constant length between the .u per end of the g, 18. Between the points 18 and 19 the inner sides or' the legs 1 and 3 are cut away at an angle.-' From the points 1.9 to the'bottom of the core the inner sides of the legs 1 and 3. are parallel to the center leg, but the distance between this portion of the inner side of each outer leg and the central' leg is, of course, greater than the distance between the upper portions of the legs.

In operation in the no load condition, the coil 7 is held in the position shown in full lines by the magnetic repulsion. between the coils 5 and 7. When the coils are so sepa-.

rated the leakage flux between the coils passing through the air gaps between the outside legs and the central legof the core, is not meterially diiierent from what it would be if thelower, inner sides of the outer legs were in the same plane as the u )per portions oftheir inner-sides. When in t e partial or full load condition, however, I the coil 7 approaches or moves into the position shown in dotted lines, the increased length of the air gap. in

of the core leg which they surround and reduced in the transverse direction, thus reducing the size and weight pf the coils. It also permits of a better coolin of the coils since the radiating surfaceof the coils is-in-, creased in proportion to their volume, and

by the ascending cooling fluid in contact with it, Whether it be air or a liquid suchas oil. I

The decrease in width of the legs land 3 adjacent the primary .coil isof little-importance inthis type of apparatus though if engaging the upper end desired this may be avoi ed by malfing the laminae as shownin Fig. 3. g

Inthe particular transformer construction illustrated, the transformer is inclosed in a 1 metallic casing 20 upon the base of which it is' held by suitable clam ing bolts 21 which connect the base and a c amping member 22 of the core; The brackets 13 are shown as bolted to the member 22. The lever arm 14 is shown as passing through a slot 23 in the casing.

While the form of my invention herein: before illustrated and described in detail has been found to give excellent results in practice, it will be understood that changes may be made in the form ofmy invention with out departing from its spirit, and; that my invention is not limited to use in the relation in which it is shown, and I do not wish the claims hereinafter made to be limited to the particular embodiment disclosed more than 1s made necessary by the state of the art.

What I claim as new and desire to secure by Letters Patent of the United States, is, l. The combination of inductively related windings, means for causing the windings to separate upon increase in current therein and to approach each other upon decrease of current, and means for varying the mean length of the air gap in the leakage path between arts ofthe upper portion.

a direction parallel to the length length of -t .ingschange their middle core le change their relative arranged t at the mean length of the air ga in the leakage ath betweenthe windings is increased as t e windings approach each other. their shape permits of a more efficient cooling 4. 111a constant current transformer, the combination of a primary winding, a secondary winding, means for allowing the said windings to move away from each other upon increase -in current and to approach each other upon decrease in current. 1n the secondary and means for varying the mean e air gap in the path of the leak age flux between said windings as said windrelative position.

5. In a' constant current transformer, a core leg, 8. primary winding surrounding said a secondary .winding'also surroundcore-le 7 ing sai core leg, and a cooperat1 core leg,

the space, between adjacent sides dfisaid core legs 'tion occupied eing eater in the vicinity of the posigr b the windings when they are in the fu load position than the average length of the gap or space between the portions of adjacent sides of the legs when the are separated in the no load or partial load conditions.

and a cooperat- '6. Aconstant current transformer, comprising three substantially parallel legs connecte by end members,

and primary and secondary windings or coils surrounding the one of said windings bei stationary an the adjacent sides of the outer core legs in proximity to the stationary winding being undercut. In witness whereof, I have hereuntoset my hand this sixth day of June, 1906.

AUGUSTINE R. EVEREST.

Witriessesz' WM. F. Dawson, ALAN A. POLLOOK. 

